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The actress, 24, peeled off for a new campaign for Chanel's Coco Mademoiselle perfume.

Brushed up nicely: Keira Knightley in the new Chanel advert appears to have a digitally-enhanced bust

And she is certainly looking particularly buxom bearing in mind she has bemoaned her lack of curves in the past.

Stripped to the waist her chest is covered only by a pair of braces, with her bust looking noticeably fuller that usual.

The Pirates of the Caribbean star also appears to have succumbed to more than a little computer wizardry to smooth out her complexion in the shots which are being used to advertise Chanel's new fragrance.

Airbrushing expert Chris Bickmore said Miss Knightley’s skin had been smoothed and her chest enlarged.

'Her face has definitely been retouched, there are no lines or wrinkles at all,' he said.

'The whites in her eyes have been made a cleaner white and there are
no lines on her neck, body or even the back of her hand where there
would definitely be some detail.

'Her breast has had some shading added to it to give it the effect
of being rounder and more pert and it has also been increased in size
slightly.'

Smoothing out: Stylists prepare Keira for the shoot, where she is looking a little flatter up top

Naturally waif-like: Keira Knightley with
her natural cleavage in Atonement (left) and at the premiere of Pirates Of The Caribbean: Dead Man's Chest

Yesterday Liberal Democrat MP Lynne Featherstone, who has been campaigning against excessive airbrushing in advertisements along with fellow MP Jo Swinson said advertisers should point out where images have been altered.

She said: 'Keira is a beautiful woman and that's the point.

'If the image has been airbrushed then people need to know so they don't try and achieve what is totally unrealistic.

'Young girls especially will try and aspire to things which often they can't achieve and which will leave them feeling bad about themselves.

'Where an image has been altered and retouched, we are simply saying there needs to be a symbol showing what has been done and where.'

It's not the first time that a Chanel advertisement featuring Knightley appears to have been altered.

In a 2007 campaign in which she featured semi-naked with just a bowler hat covering her chest she also looked decidedly more curvy than usual.

Keira Knightley's bust was digitally enhanced
in the publicity images for King Arthur in the U.S. but the British posters kept her natural physique

The actress attracted controversy in 2004 when she revealed that the publicity posters for her film King Arthur had been digitally altered.

While the British posters displayed her natural boyish look, the American ones showed her with a clearly inflated chest.

'Those things certainly weren’t mine,' she told a U.S. magazine at the time.

'We had an interesting discussion when they said, "We want to make them slightly larger and you’ll get approval' and I was like, "OK, fine. I honestly don't give a s***".'

She then admitted in 2006: 'I don’t have any t***,so I can't show cleavage.'

It's not just Knightley's small bust which has attracted attention.

Last year the actress's mother Sharman Macdonald denied that her daughter had an eating disorder, saying she has simply inherited her naturally skinny physique from her father, 63-year-old actor Will Knightley.

She said her daughter has never had to diet but instead followed a special eating plan - high in protein and carbohydrates - to keep weight on.

Miss Macdonald, 58, claimed the actress must 'eat like a horse' to keep herself at a healthy weight.

Last night a spokesman for Chanel refused to say whether or not the star's figure had been digitally altered saying: 'We have no comment.'